Reproduction steps:
1. Open the user's attached project
2. Build the project for iOS

Expected result: Build is completed
Actual result: Editor crashes when building

Reproducible with: 2020.3.27f1, 2021.2.0a11
Not reproducible with: 2021.2.0a12, 2021.2.10f1, 2022.1.0b6, 2022.2.0a3
Could not test with: 2019.4.35f1 (compiler errors when opening the project

Notes:
Not reproducible with desktop builds
Not reproducible with native Silicon Editor
Also reproducible with the same stack trace in some of the versions when switching from iOS to Android as target and vice versa
Also reproducible with the same stack trace in some of the versions when opening the project

Stack trace:
Obtained 19 stack frames.
Thread 0x314b0e000 may have been prematurely finalized
#0 0x007ff802866292 in __pthread_kill
Thread 0x314b0e000 may have been prematurely finalized
#1 0x007ff8027e8d10 in abort
Thread 0x314b0e000 may have been prematurely finalized
#2 0x007ff8027e80be in err
Thread 0x314b0e000 may have been prematurely finalized
#3 0x007ff80b6cb752 in bool MTLGetEnvCase<MTLErrorModeType>(char const*, MTLErrorModeType&, std::__1::vector<std::__1::pair<char const*, MTLErrorModeType>, std::__1::allocator<std::__1::pair<char const*, MTLErrorModeType> > > const&) (.cold.1)
Thread 0x314b0e000 may have been prematurely finalized
#4 0x007ff80b6b60c7 in MTLReportFailure
Thread 0x314b0e000 may have been prematurely finalized
#5 0x007ff80b6ae83e in _MTLMessageContextEnd